Probability 1 Question 11

19. The probability that x1+x2+x3 is odd, is

(a) 29105

(b) 53105

(c) 57105

(d) 12

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Answer:

Correct Answer: 19. (b)

Solution:

  1. PLAN Probability = Number of favourable outcomes  Number of total outcomes 

As, x1+x2+x3 is odd.

So, all may be odd or one of them is odd and other two are even.

Required probability

2C1×3C1×4C1+1C1×2C1×4C1+2C1×2C1×3C1=1C1×3C1×3C13C1×5C1×7C1=24+8+12+9105=53105



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